Quickbooks online plus custom field value is not able to retrive in Quickbooks online API

Welcome to the Community space, @JeevaAIT. Let me direct you to the appropriate support that can assist you with the custom field in your invoices. This will enable you to effortlessly include all the necessary details in your sales transactions.

There's a community dedicated to developers and integrating other websites with QuickBooks. I recommend that you sign up and post this question to our separate online forum called Intuit Developer Community.

This site contains resources for software development, as well as the ability to ask fellow developers questions. Our Intuit Developer can provide you further details on how to retrieve custom field values via QuickBooks Online API.

 Here's how:

1. Go to this link: https://help.developer.intuit.com/s/.
2. Choose QuickBooks Online under What do you need help with? 
3. Click Ask a Question. 
4. Log into your existing Intuit Developer Account or create a new one. 
5. Enter your concern. 
6. Click Ask. 
   
   
   

Additionally, you can always utilize the API Docs & Tools and Blog menu on the Intuit Developer's page. From there, you can check out the latest feature added to the application.

I'll be sharing these resources that will help you record invoice payments and customize your sales forms in QuickBooks:

• Record invoice payments in QuickBooks Online
• Customize invoices, estimates, and sales receipts in QuickBooks Online

Please post again or leave a comment on this thread should you have any additional questions about invoice transactions. I'm always here to answer them. Take good care!